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Started programming on a ZX spectrum in the 80's and have moved through Assembly, Turbo Pascal, C++, C#, Fortran. My main area of focus is engineering and scientific computing like numerical methods and 3D graphics.


Apr
24
comment Infinite series of derivatives of position when starting from rest
Is this because $\bf{e}$ is a transcendental number and thus the derivatives don't loose order.
Apr
23
comment Computing Acceleration in mass and pulley system using conservation of energy
See people.fas.harvard.edu/~djmorin/chap6.pdf
Apr
23
comment Particle moving under force $F=-cx^3$
See this answer for how to handle non uniform acceleration cases.
Apr
22
comment Can a car get better mileage driving over hills?
Typical losses on a car (like a/c running, and rolling resistance) could easily amount to 6 kW of loss.
Apr
22
comment Can a car get better mileage driving over hills?
Acceleration curves (blue) should be labeled $\dot{v}(x)$ and not $v(x)$
Apr
22
answered Torque considered about different points in a system
Apr
22
comment Torque considered about different points in a system
The edit needs to be rejected. I clicked the approve button by accident.
Apr
22
reviewed Approve Torque considered about different points in a system
Apr
22
revised Object Pushed by Multiple Forces
added 2 characters in body
Apr
21
comment Large deflection of cantilever beam
Do you measure deflection along a fixed axis, or does it follow the arc of the end of the beam?
Apr
21
comment Instant centre of rotation for two connected gears
Is O fixed in space and A orbiting around?
Apr
20
comment Energy needed for Superman to take off and fly at the speed of sound
From your first two statements you have $4.0 + 0.2 = 4.8$ ????
Apr
20
answered Object Pushed by Multiple Forces
Apr
20
comment Object Pushed by Multiple Forces
When dealing with dynamics we are compelled to choose the center of mass or else the equations of motion won't work. See physics.stackexchange.com/a/81078/392
Apr
20
comment Superposition of accelerations in multibody problem
$a_1+a_2 + \ldots = a_{net}$ is not a fundamental law of anything.
Apr
20
answered Superposition of accelerations in multibody problem
Apr
20
comment Can someone explain this solution for the motion of a falling chain?
How can I perform an experiment with an ideal chain with ideal conditions? I have observed ropes, chains and wires unfold due to gravity and I stick to me answer unless proven otherwise.
Apr
19
comment Compression in a sphere due to a sectoral load?
Note the theoretical deformation of a line load (force on circumferance) is infinite. You have to consider a certain pressure width to be able to apply Hertzian or non-Hertzian contact properties.
Apr
19
comment Compression in a sphere due to a sectoral load?
Since the loading is not uniform (only convers part of the surface) you need to solve the Bussinesq energy integrals your self and there is no guarantee that there is a numetically stable solution either. At this point I recommend going the FEA way.
Apr
17
comment Does it take more energy to open a door when applying force close to the hinge?
The force needed to accelerate the center of mass.